CN103134731A - Method for evaluating styrene butadiene styrene (SBS) mixing amount in SBS modified asphalt based on force-ductility test - Google Patents
Method for evaluating styrene butadiene styrene (SBS) mixing amount in SBS modified asphalt based on force-ductility test Download PDFInfo
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- CN103134731A CN103134731A CN201310071155XA CN201310071155A CN103134731A CN 103134731 A CN103134731 A CN 103134731A CN 201310071155X A CN201310071155X A CN 201310071155XA CN 201310071155 A CN201310071155 A CN 201310071155A CN 103134731 A CN103134731 A CN 103134731A
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Abstract
The invention relates to a method for evaluating a styrene butadiene styrene (SBS) mixing amount in SBS modified asphalt based on force-ductility test. The method comprises the following steps of: (1) obtaining a tension-displacement curve of the SBS modified asphalt by using the force-ductility test; (2) performing three-stage division on the tension-displacement curve obtained in the step (1) to obtain the tension-displacement curve of the development high-deformation stage, wherein the first stage is a common deformation stage, the second stage is a yielding stage, and the third stage is a development high-deformation stage; and (3) integrating the tension-displacement curve of the development high-deformation stage to obtain a flexibility index. The flexibility index obtained by the method can be used for evaluating the SBS mixing amount in the SBS modified asphalt. The basis is that the SBS modified asphalt flexibility index based on the force-ductility test is in linear positive correlation to the SBS mixing amount (R2=0.99) and is in linear negative correlation to the TFOT time (R2=0.98); the influences of the SBS mixing amount and an aging process on the performance of the SBS modified asphalt can be effectively distinguished; and an effective index for evaluating the SBS mixing amount in the SBS modified asphalt can be obtained.
Description
Technical field
The invention belongs to the road engineering field, be specifically related to a kind of method of estimating SBS volume in the SBS modified bitumen based on force measuring ductility test.
Background technology
The SBS performance of modified bitumen is good, has been widely used in the highway construction of China Higher level.The SBS volume is the determinative of SBS modified bitumen usability.At present, main conventional test, the dynamic shear test of adopting tested and analyzed the performance of SBS modified bitumen, to estimate the SBS volume in the SBS modified bitumen, but can not characterize the performance characteristic of SBS modified bitumen due to its test result, and can't effectively distinguish SBS volume and degree of aging to the impact of SBS performance of modified bitumen.Therefore, demand the method for SBS volume in a kind of effective evaluation SBS modified bitumen urgently.
Summary of the invention
The object of the present invention is to provide a kind of method of estimating SBS volume in the SBS modified bitumen based on force measuring ductility test, this assay method has that test operation is simple, and test findings is accurately credible, and the evaluation index mechanical meaning clearly waits characteristics.
The present invention solves above-mentioned technical matters by the following technical solutions:
A kind of method of estimating SBS volume in the SBS modified bitumen based on force measuring ductility test, concrete steps are as follows:
(1), utilize force measuring ductility test, carry out on pitch force measuring ductility test machine, the force measuring ductility test machine is comprised of common ductility machine, dynamometer, data acquisition and output unit.Adopt the 8 common ductility die trials of font, restrained stretching speed is 5cm/min, and temperature is 10 ℃; Obtain the pulling force-displacement curve of SBS modified bitumen;
(2), step (1) gained pulling force-displacement curve being carried out for three stages divides, phase one is the common deformation stage, namely stretch zero displacement point O to the OA section of maximum pull point A, subordinate phase is the surrender stage, be that maximum pull point A is to the AB section of surrendering stage end point B, phase III is the development large deformation stage, and surrender stage end point B is the development large deformation stage to the BC section curve of tension failure point C, the pulling force-displacement curve in acquisition development large deformation stage;
Wherein, definite method of surrender end point B is: at first, default B point on AC section curve is respectively on AB, BC section segment of curve, each equidistantly gets the pulling force-displacement data of 10 points; Then, respectively between A, B point and B, C point between pulling force-the displacement data point carries out linear fit, if the coefficient R of fitting a straight line AB, BC
2All greater than 0.85, the B point is the separation of surrender stage with the development large deformation stage, otherwise, reset B point position;
(3), the pulling force-displacement curve in step (2) gained development large deformation stage is carried out integration, obtain toughness index, integral equation is seen formula (1);
In formula, S-toughness, Ncm;
: D-displacement, cm;
A, b, c-regression parameter, dimensionless;
D
BThe displacement of-B point, cm;
D
CThe displacement of-C point, cm.
Wherein, regression parameter a, b, c can carry out the quadratic polynomial curvilinear regression to the pulling force-displacement data between B, C point and obtain by using Mathematical Statistics Analysis software.The present invention proposes first that in the toughness index of SBS modified bitumen and SBS modified bitumen, SBS content is linear positive correlation.Be the toughness index of checking SBS modified bitumen and the linear positive correlation relation of SBS content, the SBS modified bitumen of selecting the SBS volume of indoor preparation to be respectively the different TFOT times (5h, 10h, 15h) of 2%, 3%, 4%, 5% and 6% SBS modified bitumen and 3%SBS volume carries out conventional test, dynamic shear test and force measuring ductility test, and test findings sees Table 1 and table 2.
The adulteration modified asphalt performance index of the different TFOT of table 1 time 3%SBS
The adulteration modified asphalt performance index of the different SBS of table 2
Can find out, except stretch indexe, in the indexs such as pen., softening point and the rut factor and SBS modified bitumen, SBS volume and the correlationship of TFOT time have consistance, can't effectively distinguish SBS volume and TFOT time to the impact of SBS performance of modified bitumen.When (〉=5%), stretch indexe and SBS volume and TFOT time negative correlation can't differentiate the reason that SBS modified bitumen denseness increases, and stretch indexe can't embody the performance characteristic of SBS modified bitumen when the SBS volume in the SBS modified bitumen is higher.Toughness index and SBS volume linear positive correlation (R
2=0.99), with TFOT time negative correlation (R
2=0.98), can effectively distinguish SBS volume and degree of aging to the impact of SBS performance of modified bitumen, be the efficiency index of estimating SBS volume in the SBS modified bitumen.
Description of drawings
Fig. 1 divides schematic diagram in three stages of SBS modified bitumen pulling force-displacement curve that the present invention is based on force measuring ductility test; OA is common deformation stage pulling force-displacement curve, AB is surrender stage pulling force-displacement curve, BC is development large deformation stage pulling force-displacement curve, and dotted line 1 is the fitting a straight line of pulling force-displacement data point between A, B point, and dotted line 2 is the fitting a straight line of pulling force-displacement data point between B, C point.
Fig. 2 uses the adulteration modified pitch pulling force of certain SBS based on force measuring ductility test of the present invention-displacement curve schematic diagram.
Embodiment
Further describe by reference to the accompanying drawings the present invention below by embodiment.
Embodiment 1:
(1) shaping test piece: asphalt heating is cast in the common ductility die trial of " 8 " font to the trickling state, cooling 30 ~ 40 minutes of room temperature is positioned in the Water Tank with Temp.-controlled of 10 ℃, keeps taking out after 30 minutes, strike off the pitch that exceeds die trial with hot scraper, bituminous sheaths is flushed with die trial face.
(2) insulation: the pitch test specimen is positioned in the force ductility instrument Water Tank with Temp.-controlled of 10 ℃ and is incubated, the insulation test specimen is not less than 60 minutes.
(3) lay test specimen: the hole at pitch test specimen die trial two ends is enclosed within respectively on the fixing metal bar of force ductility instrument tank section end, and takes off side form.The water surface should be not less than 25mm apart from the test specimen surface.
(4) carry out force measuring ductility test: it is 5cm/min that draw speed is set, and data acquisition system (DAS) is CCRDI data acquisition system 32 v2. 0, can record the tension variations value that ductility machine stretching time, displacement and sensor collect.
(5) three stages of pulling force-displacement curve divide: with the data analysis that collects, as shown in Figure 1, find out the maximum pull point A on stretching displacement O at zero point and pulling force-displacement curve, determine surrender stage end point B, segment of curve OA, AB, BC are respectively the pulling force-displacement curve in common deformation stage, surrender stage, development large deformation stage.
(6) toughness is calculated: sharp formula (1) is carried out integration to the pulling force-displacement curve in step (2) gained development large deformation stage, obtains the toughness of SBS modified bitumen; Integral equation is seen formula (1).
(1)
In formula, S-toughness, Ncm;
D-displacement, cm;
A, b, c-regression parameter, dimensionless;
D
BThe displacement of-B point, cm;
D
CThe displacement of-C point, cm.
An example as shown in Fig. 2: by force measuring ductility test, obtain the pulling force-displacement curve of the adulteration modified pitch test specimen of certain SBS, can learn C point displacement D by pulling force-displacement curve
CBe 46cm; By the three stages division to pulling force-displacement curve, can determine B point displacement D
BBe 9.3cm; Regression parameter a, b, c are respectively 0.005 ,-0.175,38.2, and toughness index is:
Claims (1)
1. method of estimating SBS volume in the SBS modified bitumen based on force measuring ductility test is characterized in that concrete steps are as follows:
(1), utilize force measuring ductility test, carry out on pitch force measuring ductility test machine, the force measuring ductility test machine is comprised of common ductility machine, dynamometer, data acquisition and output unit; Adopt the 8 common ductility die trials of font, restrained stretching speed is 5cm/min, and temperature is 10 ℃; Obtain the pulling force-displacement curve of SBS modified bitumen;
(2), step (1) gained pulling force-displacement curve being carried out for three stages divides, phase one is the common deformation stage, be that stretching displacement O at zero point is to the OA section of maximum pull point A, subordinate phase is the surrender stage, be that maximum pull point A is to the AB section of surrendering stage end point B, phase III is the development large deformation stage, and surrender stage end point B is the development large deformation stage to the BC section curve of tension failure point C, the pulling force-displacement curve in acquisition development large deformation stage;
Wherein, definite method of surrender end point B is: at first, default B point on AC section curve is respectively on AB, BC section segment of curve, each equidistantly gets the pulling force-displacement data of 10 points; Then, respectively between A, B point and B, C point between pulling force-the displacement data point carries out linear fit, if the coefficient R of fitting a straight line AB, BC
2All greater than 0.85, the B point is the separation of surrender stage with the development large deformation stage, otherwise, reset B point position;
(3), the pulling force-displacement curve in step (2) gained development large deformation stage is carried out integration, obtain toughness index, integral equation is seen formula (1);
In formula, S-toughness, Ncm;
D-displacement, cm;
A, b, c-regression parameter, dimensionless;
D
BThe displacement of-B point, cm;
D
CThe displacement of-C point, cm;
Wherein, regression parameter a, b, c can carry out the quadratic polynomial curvilinear regression to the pulling force-displacement data between B, C point and obtain by using Mathematical Statistics Analysis software.
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| CN201310071155XA CN103134731A (en) | 2013-03-06 | 2013-03-06 | Method for evaluating styrene butadiene styrene (SBS) mixing amount in SBS modified asphalt based on force-ductility test |
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| CN201310071155XA CN103134731A (en) | 2013-03-06 | 2013-03-06 | Method for evaluating styrene butadiene styrene (SBS) mixing amount in SBS modified asphalt based on force-ductility test |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103335899A (en) * | 2013-06-14 | 2013-10-02 | 中国石油天然气集团公司 | Method and device for determining uniform ductility of hi-grade steel pipeline steel pipe |
| CN104048985A (en) * | 2014-06-06 | 2014-09-17 | 西安公路研究院 | Method for determining mixing amount of modifying agent in SBS modified asphalt |
| CN105300826A (en) * | 2015-11-24 | 2016-02-03 | 交通运输部公路科学研究所 | Asphalt ductility machine calibration method and device |
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| EP0936232A1 (en) * | 1998-02-13 | 1999-08-18 | The Goodyear Tire & Rubber Company | Continuous polymerization process |
| US6136899A (en) * | 1999-09-14 | 2000-10-24 | The Goodyear Tire & Rubber Company | SBR for asphalt cement modification |
| CN101281107A (en) * | 2008-05-16 | 2008-10-08 | 东南大学 | Bituminous cement force measuring ductility test method |
-
2013
- 2013-03-06 CN CN201310071155XA patent/CN103134731A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0936232A1 (en) * | 1998-02-13 | 1999-08-18 | The Goodyear Tire & Rubber Company | Continuous polymerization process |
| US6136899A (en) * | 1999-09-14 | 2000-10-24 | The Goodyear Tire & Rubber Company | SBR for asphalt cement modification |
| CN101281107A (en) * | 2008-05-16 | 2008-10-08 | 东南大学 | Bituminous cement force measuring ductility test method |
Non-Patent Citations (2)
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| 孙大权等: "基于测力延度试验的聚合物改性沥青低温拉伸性能研究（2）聚合物改性沥青测力延度拉伸变形机理分析", 《石油沥青》, vol. 19, no. 5, 31 October 2005 (2005-10-31) * |
| 岳学军等: "测力延度试验以及韧性比评价指标的研究", 《公路交通科技》, vol. 24, no. 2, 28 February 2007 (2007-02-28), pages 33 - 36 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103335899A (en) * | 2013-06-14 | 2013-10-02 | 中国石油天然气集团公司 | Method and device for determining uniform ductility of hi-grade steel pipeline steel pipe |
| CN103335899B (en) * | 2013-06-14 | 2015-05-06 | 中国石油天然气集团公司 | Method and device for determining uniform ductility of hi-grade steel pipeline steel pipe |
| CN104048985A (en) * | 2014-06-06 | 2014-09-17 | 西安公路研究院 | Method for determining mixing amount of modifying agent in SBS modified asphalt |
| CN105300826A (en) * | 2015-11-24 | 2016-02-03 | 交通运输部公路科学研究所 | Asphalt ductility machine calibration method and device |
| CN105300826B (en) * | 2015-11-24 | 2018-11-06 | 交通运输部公路科学研究所 | The calibration method and device of bitumen ductility instrument |
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Application publication date: 20130605 |